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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 4839 | * |
| 4840 | * The string returned here consists of a space or carriage return-delimited list |
| 4841 | * of trackback URLs. |
| 4842 | * |
| 4843 | * @since 3.4.0 |
| 4844 | * |
| 4845 | * @param string $urls_to_ping Sanitized space or carriage return separated URLs. |
| 4846 | * @param string $to_ping Space or carriage return separated URLs before sanitization. |
| 4847 | */ |
| 4848 | return apply_filters( 'sanitize_trackback_urls', $urls_to_ping, $to_ping ); |
| 4849 | } |
| 4850 | |
| 4851 | /** |
| 4852 | * Add slashes to a string or array of strings. |
| 4853 | * |
| 4854 | * This should be used when preparing data for core API that expects slashed data. |
| 4855 | * This should not be used to escape data going directly into an SQL query. |
| 4856 | * |
| 4857 | * @since 3.6.0 |